Sunrace 7 Speed Freewheel

Customer Reviews (6)
4.5 / 5| Write your review
£18.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- Function: Road & MTB
- Speed: 7 Speed
- Number of Teeth: Road 13-25T / MTB 13-28T
- Sprocket Material: Steel
- Spacer Material: Engineering Polymers
- Chain Compatibility: 7.3mm
- Average Weight: 460g

Ratios Choices:
- Road 13-25T = 13 / 15 / 17 / 19 / 21 / 23 / 25T
- MTB 13-28T = 13 / 15 / 17 / 19 / 21 / 24 / 28T

Requires a Shimano type splined freewheel removal tool. (Shimano's own is SJSC part #870)
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Product Reviews (6)
Questions & Answers (12) Q & A
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Product Reviews (6)
Overall Product Rating 4.5 / 5
7 speed cassette.
By Wayne
12 May 2020
4 / 5
I recommend this product
Good quality product
Excellent - very happy
02 May 2020
5 / 5
I recommend this product
ProsGood fit, quailty and performance.
I bought this to replace a Shimano 14-28 as I wanted a bit higher top gear without going to the bother & expense of converting to a cassette.
It works brilliantly - runs quietly, and coupled with a new SRAM chain the gear shifting is smooth and precise, in fact better than it's ever been. Maybe the chrome plating helps in this respect.
Terrific value for money, build quality is very good.
No problems so far
01 May 2018
5 / 5
I recommend this product
I've been running this freewheel for about 5000 miles.
No problems so far. Nice silver freewheel which goes with my 30 year old tourer, and replaces the old worn Sachs Maillard 13-30 which was on it previously.
Excellent Low Cost Freewheel
By Anonymous
21 Mar 2017
5 / 5
I recommend this product
ConsNone so far
ProsGood value and quality
I bought this freewheel to replace a defective Shimano one on my son's rather old mountain bike. Fitting was simple using the Shimano removal tool and to date it has performed faultlessly. My son prefers this freewheel because of the 13t small cog compared with 14t on the Shimano.
First Hyperglide
By Nick
03 Mar 2013
4 / 5
ProsChanges, ratchet
Normally remachine my own from standard freewheels. Greatly simplified by buying this. Would like to see a second option 13 to 21 close ratio version
By Anonymous
01 Feb 2013
4 / 5
I recommend this product
Proslooks good
i must say that the help over the phone was amazing thanks for all your help he freewheel is great fits a dream and very quiet
Questions & Answers (12)
Is the 13t cog black or silver?
26 Jul 2020
The 13t cog is silver
What’s the best chain for the 13/25 cassette on a MTB?
06 Mar 2020
I recently swapped my MTBs Shimano MFTZ21 (14/28) to the Sunrace 13/25, along with a new Shimano HG40 chain (7.3mm as recommended). But I now feel a constant grinding/vibration when I peddle, it’s not smooth like the old MFTZ21/HG40 set up.
When not riding/checking the indexing there’s no sound and the gears shift fine. After only 250 miles the chain is nearly at 0.75 and slips in and out of gear when peddling with force.
Did I choose wrong by using a road cassette on a MTB (I wanted a tighter teeth ratio) or would a different chain make/model stop the vibration?
That chain / cassette should be absolutely fine. The issue my be that your chainrings are worn. We recommend heading for the local bike shop and have them take a look.

Thanks - 13/03/20
Suitable replacement for the Shimano MFTZ 500-7 freewheel unit?
20 Jun 2019
I have a new Brand-X road bike fitted with the O/E 7spd Shimano MFTZ 500-7 14-28t freewheel unit.
As I want to increase the gearing slightly would this Sunrace Index 7spd 13-28t unit be a suitable replacement?
Yes this should be a fine replacement.

Thanks - 21/06/19
The specification says that it is compatible with 7.3mm chain. Is this the same as 3/16? Thanks
26 Nov 2018
Not quite, you simply need a 3/32 6/7/8 speed chain.

Thanks - 26/11/18
Is this suitable for a C Record Campagnolo hub?
05 Nov 2018
Hi there,

Unfortunately as we do not stock that particular hub we would have nothing to refer to so we would not know im afraid.

Difference between road and MTB versions?
13 Oct 2018

Is there any difference between the road and MTB versions aside from the number of teeth? Is there anything stopping me from running the MTB version on a road bike?

Simply the ratios!

thanks - 15/10/18
14 May 2017
Hi. Will this screw on to an early 90's Mavic hub? If not do you do one? Thanks

Providing you hub has an English 1.375" x 24TPI thread then this freewheel will screw on without any issues. Mavic however produced hubs in both English thread and French thread (1.366" x 25.4TPI) so you'll need to carefully check which your hub uses.

What Is The Stack Height For This Product Please?
28 Sep 2016
I have an old racer with 126mm dropout spacing looks like there's about 39-40mm available for the freewheel, it may be that sunrace's 6 spd is a better option, again not sure what the stack height is there.

This 7spd freewheel has a stack height of 37mm so should hopefully fit okay.

Dear Sir, Is This Item A Suitable Replacement For A Shimano Mftz21.
07 Dec 2015
It does not say in the product description if it has Shimano spacing between ratios. The cycle has a Shimano shifter and derailleur.

This freewheel is indeed a suitable replacement for a MF-TZ21 freewheel as it is designed around Shimano gearing.

Will It Fit On An Electric Bike?
20 Apr 2015

I'm afraid without some more information I'm going to have no idea if it will fit your bike. This freewheel fits to any wheel that is designed to take a screw on freewheel, if your wheel is like this then it will fit, if its not then it will not fit.

Does This Need To Be Torqued Up When Fitted?
09 Feb 2015
If yes, what torque setting would be suitable?

This would not need to be torqued up. As long as it is done up fairly tight initially, pedalling the bike will keep tightening it up as far as it needs to as well as keeping it tight enough.

Is This A Screw On Type Freewheel?
25 Feb 2014

Yes, this is a 7spd screw-on freewheel.